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SubjectRe: O_DIRECT question
You guys need to backup in this thread.

Every example of O_DIRECT here could be replaced with
calls to mmap(), msync(), and madvise() (or posix_fadvise).

In addition to being at least as fast as O_DIRECT,
these have the added benefit of using the page cache
(avoiding reads for data already present, handling multiple
users of the same data, etc..).

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